Agnostic. Agnosticism is the understanding that the non-falsifiable cannot be known to exist, and atheism is the understanding that you can't afford belief to the unsubstantiated anyway.

For practical purposes the "odds of gods" are so vanishingly small that it's a legitimate semantic shortcut to say that a specific god does not exist, however, in a technical, philosophical sense, we cannot stake a knowledge claim and therefore, there's no basis to form beliefs about it, one way OR the other.

Still, in that circumstance, one lives and makes decisions exactly the same as if one were quite sure there are no deities.

Considering all the IMPOSED 'definitions,' etc that seem to placed upon Atheists simply to, in my opinion, lend credence to the faux beliefs of Xtians, etc, then I'd honestly state clearly that I am an Atheistic Atheist and should their Totally Imaginary God appear before me in the guise of a burning bush then my response would more than likely be to piss upon it until I'd put it out permanently.

Pick a god to ask me about. I'm probably a gnostic atheist in regard to that god. In regard to all unexaminable possibilities, e.g. aliens or simulation theory, no one is a gnostic anything.